add task solution

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[mateacademy-ai-mentor]

Review Summary

The test file you've created is well-structured and covers all required scenarios, which is great work. However, there's a critical issue: the restoreNames.js implementation file is missing from your submission. The tests reference this file with require('./restoreNames'), but without the actual implementation, the test suite cannot run and no code can be validated. Please add the restoreNames.js file that contains the function implementation. Once the implementation is in place alongside these tests, they should validate that the function correctly handles preserving existing firstName values, restoring missing firstName from fullName, and processing multiple users in an array.

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[mateacademy-ai-mentor]

Review Summary

Your implementation of the restoreNames function is complete and correct. The function properly handles all required scenarios: preserving existing firstName values using a falsy check, extracting first names from fullName by splitting on space and taking the first element, and mutating the input array in place without returning anything. The test suite provides comprehensive coverage for all scenarios including users with existing names, missing names, undefined names, and multiple users. All requirements from the task checklist are satisfied. Great work on this implementation!

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